How to Export Only Part of a Destructuring Assignment in JavaScript

Learn how to export only specific parts of a destructuring assignment in JavaScript and TypeScript, focusing on exporting `rest` while excluding others.
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How to Export Only Part of a Destructuring Assignment in JavaScript

When working with JavaScript, especially with modern ES6 syntax, destructuring assignment has become a powerful tool. However, when it comes to exporting destructured values, many developers encounter confusion. A common question arises: How can you export only part of a destructuring assignment, specifically the remaining properties?

In this guide, we’ll break down this concept clearly and provide practical examples to help you understand how to achieve this in both JavaScript and TypeScript.

The Problem: Exporting Parts of Destructured Objects

Let's take a look at the situation. Suppose you have an object defined as follows:

[[See Video to Reveal this Text or Code Snippet]]

Using destructuring assignment, you can extract values like this:

[[See Video to Reveal this Text or Code Snippet]]

Here, a is extracted, and rest gathers all remaining properties into a new object. This works perfectly when you're merely using these variables within a file. But the challenge comes when you want to export rest and not a.

In TypeScript, you might find that when you do the initial export with export const { a, ...rest }, both a and rest get exported. Let’s explore how to export only rest instead.

The Solution: Exporting Rest with Examples

1. Exporting as Default

If you want to export rest as the default export of a module, you can do this simply:

data.js:

[[See Video to Reveal this Text or Code Snippet]]

main.js:

[[See Video to Reveal this Text or Code Snippet]]

In this example, we directly export rest as the default export, making it available to any other module that imports it.

2. Exporting as Named Export

Alternatively, if you prefer to have rest as a named export, you can do so like this:

data.js:

[[See Video to Reveal this Text or Code Snippet]]

main.js:

[[See Video to Reveal this Text or Code Snippet]]

In this case, rest is explicitly exported, and when imported, it retains its structure and values.

Conclusion

Exporting specific parts of a destructured assignment in JavaScript may seem tricky at first, but with the right approach, it's quite straightforward! By following the examples provided in this guide, you can effectively manage your exports and streamline your module organization.

For more JavaScript tips and tricks, stay tuned to our blog! Happy coding!